Thryssa dayi, also known as Day's thryssa, is a species of ray-finned fish in the family Engraulidae. It is found in the western Indian Ocean.Whitehead, P.J.P., G.J. Nelson and T. Wongratana, 1988. FAO Species Catalogue. Vol. 7. Clupeoid fishes of the world (Suborder Clupeoidei). An annotated and illustrated catalogue of the herrings, sardines, pilchards, sprats, shads, anchovies and wolf-herrings. FAO Fish. Synop. 125(7/2):305-579. Rome: FAO.
Size This species reaches a length of .
Etymology The fish is named in honor of Francis Day (1829–1889), the Inspector-General of Fisheries in India.
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